Some blue info here about channeled spells:
It seems channeled spells have cycles. One cycle is equal to the time it takes to make 1 weapon attack. Over the course of that cycle, the skill's listed % damage will be done over multiple ticks. Does anyone have a different interpretation?
I assume that the listed resource cost of the channeled spell will be consumed over the course of that 1 cycle as well. That would be consistent with a previous blue post about increased attack speed having the effect of increased dps but also increased resource consumption as well. Still there are a few questions.
How many ticks are displayed in one cycle?
How are things affected if you are dual wielding?
I don't have the beta so I can't test these things out.